But while it has apologised for the action, it has also disputed a second alleged attack for which it says it is not responsible.

More than 60 refugees are reported to have been killed in at least two attacks in the province.

Serb media say one bomb fell directly on a convoy of civilians on their way home.

Homes were left ruined by another explosion.

Nato has admitted that one of its missiles struck a convoy - but it is unclear which convoy was hit.

Pictures from both blasts show vehicles destroyed.

Serb TV also showed paramedics working at both scenes, taking the survivors to hospital.

At one of the scenes, victims were taken away by wheelbarrow.